A Syrian rebel stands guard next to a comrade praying during a short break of heavy …

Syria's prime minister Riad Hijab joined the anti-regime revolt and fled abroad, in what Washington and the opposition hailed on Monday as a major blow to President Bashar al-Assad.

Government forces, meanwhile, were poised to launch an assault on rebels in Aleppo, Syria's commercial capital, as a monitoring group said at least 137 people were killed in violence across the country.

In the highest-ranking defection of the nearly 17-month uprising, Hijab, a leading Sunni Muslim in Assad's minority Alawite-dominated regime, announced he was joining the rebels after crossing into Jordan on Sunday night.

He accused his former master of carrying out "genocide" against his own people but said four decades of Assad family rule were collapsing.

"I announce my defection today from the regime of killing and terror, and I join the ranks of the revolt," Hijab said in statement read by his spokesman Mohammed al-Otri on Al-Jazeera news channel from Amman.

Otri said the defector was headed for Qatar.

Hijab's home province of Deir Ezzor in the northeast has been one of the key battlegrounds of the conflict and seen a mounting death toll from operations by the army.

The latest defection shows Assad has lost control of the country and that his people believe his days are numbered, a US official in Washington told AFP.

The surprise development was "just the latest indication that Assad has lost control of Syria and that the momentum is with the opposition forces and the Syrian people," National Security Council spokesman Tommy Vietor said.

The Syrian opposition in Jordan said Hijab and his family had slipped over the border during the night accompanied by two government ministers and three army officers.

"The Free Syrian Army helped all of them cross the border... Several other army officers defected and arrived in Jordan last night," said Syrian National Council member Khalid Zein al-Abedin.

SNC leader Abdel Basset Sayda said "this defection shows that the regime is disintegrating. It is the beginning of the end," while the Muslim Brotherhood hailed what it called "a courageous expression of great nationalism."

In Damascus, state television put out a terse report announcing that Hijab had been dismissed and replaced on an interim basis.

Information Minister Omran al-Zohbi later said defections at whatever level would have no impact on the Syrian state, while denying that any other ministers had switched allegiances.

The 46-year-old Hijab was only appointed on June 6 after a widely boycotted May 7 parliamentary election that was hailed as a centrepiece of reform by the Assad regime but dismissed as a farce by Arab and Western governments.

An agricultural engineer by training, he was agriculture minister under his predecessor Adel Safar.

Word of his defection came as the Syrian army readied a major ground assault against rebels in the northern city of Aleppo who say they control half of the city of some 2.7 million people.

It also came as a bomb blast rocked Syrian state television headquarters in the heart of Damascus, wounding several people just two days after the army said it had seized the last rebel-held area of the capital.

The morning bombing struck management offices on the third floor of the television building in the heavily protected Omayyad district of the city.

In Aleppo, the army bombarded a string of rebel neighbourhoods after government security officials said troops had completed their build-up and that a 20,000-strong force was poised for a ground assault.

A rebel commander was killed in the Salaheddin district in the southwest, and troops shelled the Palace of Justice as well as the Marjeh and Shaar districts, the Observatory said.

At least 21 civilians were killed in the city of Aleppo, said the Syrian Observatory for Human Rights, which gave a death toll of 137 across the country on Monday, including 82 civilians.

The head of the UN Supervision Mission in Syria, Lieutenant General Babacar Gaye, on Monday issued an appeal on behalf of civilians, amid fears of a looming bloodbath in Aleppo.

"I urge the parties to protect civilians and respect their obligations under international humanitarian law. Civilians must not be subjected to shelling and use of heavy weapons," he said.

A Syrian rebel group, meanwhile, which has claimed responsibility for the kidnapping of 48 Iranians in Damascus said three of its hostages were killed in shelling by government troops on Monday.

Editor’s note:Yahoo Philippines encourages responsible comments that add dimension to the discussion. No bashing or hate speech, please. You can express your opinion without slamming others or making derogatory remarks.

Government troops captured Sunday a bomb and weapons factory of the Bangsamoro Islamic Freedom Fighters (BIFF) in Mamasapano, Maguindanao, the Armed Forces of the Philippines (AFP) announced yesterday. Col. Restituto Padilla, AFP spokesman, said the captured bomb and weapons factory is located inside an area controlled by radical Muslim cleric Ustadz Mohammad Ali Tambako at Barangay Dasikil in Mamasapano. …

Instead of filing an opposition, ombudsman prosecutors filed a manifestation yesterday expressing belief that there is no urgent need for Sen. Ramon “Bong” Revilla Jr. to visit his son at the Asian Hospital and Medical Center. “Based on the clinical abstract issued by the Asian Hospital on patient (Cavite) Vice-governor (Jolo) Revilla, which was submitted by accused Revilla in support of his Urgent Motion, Vice-governor Revilla is in stable condition and has stable vital signs, as of March 1, …

North Korea fired two short-range ballistic missiles into the sea and vowed "merciless" retaliation Monday as the US and South Korea kicked off joint military drills denounced by Pyongyang as recklessly confrontational. The annual exercises always trigger a surge in military tensions and warlike rhetoric on the divided peninsula, and analysts saw the North's missile tests as a prelude to a concerted campaign of sabre-rattling. "If there is a particularly sharp escalation, we could see the …

CAIRO (AP) — Three British schoolgirls believed to have gone to Syria to become "jihadi" brides. Three young men charged in New York with plotting to join the Islamic State group and carry out attacks on American soil. A masked, knife-wielding militant from London who is the face of terror in videos showing Western hostages beheaded. …

Filipinos aspiring to work overseas should avoid dealing with a recruitment agency that has duped jobseekers worldwide, Labor Secretary Rosalinda Baldoz said yesterday. The National Bureau of Investigation has padlocked Global Visas Inc., which is based in Cebu. Baldoz said the agency’s parent company, ICS Global Visas Inc. based in the United Kingdom, has reportedly collapsed and left thousands of applicants without jobs. “Global Visas was in the limelight this week, following its reported …

Colleagues of boxing champion Manny Pacquiao at the House of Representatives backed yesterday a proposal to exempt his earnings from his May 2 fight with American Floyd Mayweather from income tax. Internal Revenue Commissioner Kim Henares has urged Pacquiao to promptly pay taxes on his May 2 earnings, which are projected to reach at least $120 million (more than P5.2 billion). …

MOSCOW (AP) — The 23-year-old Ukrainian model who was with slain opposition leader Boris Nemtsov tearfully recounted Monday their last dinner in a chic Red Square restaurant and their walk onto a nearby bridge — but said she did not see the gunman who pulled the trigger. …